Enameling or glazing metallic and other surfaces.



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ENAMELING OR GLAZING METALLlC'AND OTHER SURFACES.

Specification of Letters Patent.

Patented Feb. 12, 1907.

Application filed October 6, 1906. Serial No. 337,776.

To all whom, zit may concern:

Be it known that we, WILLIAM ATKINSON and JOSEPHSMITH, residing at Bradford, inthe county of York, England, have invented certain new and useful Improvements in Enameling or Glazing Metallic and other Surfaces; and we do hereby declare the following to bea full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to makeand use the same.

The subject of this invention is a process of coating metallic and other surfaces or objecfs with glass, porcelain, or the like mater1a Metallic objects in large variety composed, for example, of iron, steel, copper, or various alloys can advantageously be provided with a lamina or layer of glass, porcelain, or the like, and es ecially where'such objects are ex osed to the action of moisture or to chemica action in general or to electric currents.

According to our process the articles to be coated with glass, porcelain, or the like are first thoroughly cleaned, which cleaning may be accomplished in any convenient manner acid-bath consisting, say, of twenty-five parts of sulfuric acid and one hundred arts of water. The articles may be plunged into the acid-bath and then thrown into a furnace, where they are allowed to remain until attaining a red heat, when the acid deoxi- 'dizes the surfaceof the metal. After the articles have been cleaned a flux is applied thereto, which flux, in the case of wroughtiron or steel articles, may consist of one hundred and thirty parts of white opal cullet, twenty parts of bicarbonate of soda, and twelve parts of boracic acid. Where the articles to be coated are made of cast-iron or metals or alloys other than wrought-iron and five parts of bicarbonate of soda and thirteen parts of boracic acid with the same quantitythat is, one hundred and thirty partsof white opal cullet. These constituents having been reduced to a uniform mass by melting in a furnace are run into water, after which they are pounded into a powder and ground, with water, into an im alpable paste. The flux thusformed is t en applied to the article under operation and allowed to dry, when the article is fired or baked. White 0 a1 cullet or other suitable form of glass, sucfi as pure flint-glass or sodaglass, formed into a liquid paste in the same manner as the fiuxthat is, by being melted in a furnace, run into water, pounded into powder, and ground with wateris then applied to the article either in the liquid state or it may be in the form of plaster. The article is then gradually dried and afterward fired at a high temperature, preferably just under the melting-point of the metal. sired, anothercoat or lamina of glaze may then be applied. Porcelain shards or broken or waste porcelain may be a plied in the same way, with theexce tion t at porcelain, being infusible, will be eated to a red heat (instead of being 'melted) before being thrown into water.

The process though peculiarly adapted for coating metallic surfaces or objectssuch, for instance, as rollers used in dyeing-machines and the like," loom picker-spindles,-

spinning, twisting, and other guides, and a variety of similar objects-is applicable also for coating non-metallic surfaces or objects,

such as pottery.

We claim as our invention- 1. Aprocess of enameling or glazing metallic and other surfaces, characterized by the use of a flux com rising white opal cullet, bicarbonate of soda, and boracic acid, in suitable ro ortions, the said constituents being me te together in a furnace, run into water, pounded into powder, and ground with water into an impalpable paste.

2. A flux consisting of a mixture of white opag cullet, bicarbonate of soda, and boracic ac1 In testimony whereof we aflix our signa tures in presence of two witnesses.

WILLIAM ATKINSON. JOSEPH SMITH.

Witnesses:

LEONARD H. CROWLEY, W. H. KENNARD.

If de- 

